/* Base Variables & Reset */
:root {
  /* Primary Colors - Tetrad Scheme */
  --color-primary: #4062bb;
  --color-primary-dark: #2a4494;
  --color-primary-light: #6a89e0;
  
  --color-secondary: #bb4062;
  --color-secondary-dark: #94294a;
  --color-secondary-light: #e06a89;
  
  --color-tertiary: #62bb40;
  --color-tertiary-dark: #4a9429;
  --color-tertiary-light: #89e06a;
  
  --color-quaternary: #40bb62;
  --color-quaternary-dark: #299447;
  --color-quaternary-light: #6ae089;
  
  /* Neutrals */
  --color-black: #1a1a1a;
  --color-dark-gray: #333333;
  --color-gray: #666666;
  --color-light-gray: #e0e0e0;
  --color-off-white: #f8f8f8;
  --color-white: #ffffff;
  
  /* Functional Colors */
  --color-success: var(--color-tertiary);
  --color-warning: #f0b429;
  --color-error: var(--color-secondary);
  --color-info: var(--color-primary);
  
  /* Font Families */
  --font-heading: 'Roboto', sans-serif;
  --font-body: 'Lato', sans-serif;
  
  /* Font Sizes */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-md: 1.125rem;   /* 18px */
  --font-size-lg: 1.25rem;    /* 20px */
  --font-size-xl: 1.5rem;     /* 24px */
  --font-size-2xl: 2rem;      /* 32px */
  --font-size-3xl: 2.5rem;    /* 40px */
  --font-size-4xl: 3rem;      /* 48px */
  
  /* Spacing */
  --space-xs: 0.25rem;        /* 4px */
  --space-sm: 0.5rem;         /* 8px */
  --space-md: 1rem;           /* 16px */
  --space-lg: 1.5rem;         /* 24px */
  --space-xl: 2rem;           /* 32px */
  --space-2xl: 3rem;          /* 48px */
  --space-3xl: 4rem;          /* 64px */
  
  /* Borders & Shadows */
  --border-radius-sm: 0.25rem; /* 4px */
  --border-radius-md: 0.5rem;  /* 8px */
  --border-radius-lg: 1rem;    /* 16px */
  --border-radius-xl: 1.5rem;  /* 24px */
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Z-indices */
  --z-negative: -1;
  --z-elevate: 1;
  --z-sticky: 100;
  --z-header: 200;
  --z-dropdown: 300;
  --z-modal: 400;
  --z-popover: 500;
  --z-tooltip: 600;
  
  /* Container widths */
  --container-max-width: 1200px;
  --container-padding: var(--space-md);
}

/* Global Typography */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-dark-gray);
  background-color: var(--color-white);
  overflow-x: hidden;
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 var(--space-md);
  color: var(--color-black);
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-md);
}

p {
  margin: 0 0 var(--space-lg);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* Utility Classes */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.text-left {
  text-align: left;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Buttons */
.btn, 
button, 
input[type="submit"] {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: var(--font-size-base);
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius-md);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  border: 2px solid transparent;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  line-height: 1;
}

.btn:hover, 
button:hover, 
input[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.btn:active, 
button:active, 
input[type="submit"]:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
}

.btn-secondary {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: var(--color-secondary-dark);
  color: var(--color-white);
}

.btn-tertiary {
  background-color: var(--color-tertiary);
  color: var(--color-white);
}

.btn-tertiary:hover {
  background-color: var(--color-tertiary-dark);
  color: var(--color-white);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-text {
  color: var(--color-primary);
  padding: 0;
  background: none;
  border: none;
  box-shadow: none;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
}

.btn-text:hover {
  color: var(--color-primary-dark);
  box-shadow: none;
  transform: none;
  text-decoration: underline;
}

.btn-text:after {
  content: "→";
  margin-left: 0.3rem;
  transition: transform var(--transition-base);
}

.btn-text:hover:after {
  transform: translateX(4px);
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--color-white);
  box-shadow: var(--shadow-md);
  padding: 1rem 0;
  z-index: var(--z-header);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

.logo img {
  height: auto;
  display: block;
  width: 60px;
}

.nav-list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list li {
  margin: 0 var(--space-md);
}

.nav-list a {
  color: var(--color-dark-gray);
  font-weight: 500;
  padding: 0.5rem 0;
  position: relative;
  text-decoration: none;
}

.nav-list a:before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.nav-list a:hover {
  color: var(--color-primary);
}

.nav-list a:hover:before {
  width: 100%;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 2rem;
  height: 2rem;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

.mobile-menu-toggle span {
  width: 2rem;
  height: 0.25rem;
  background-color: var(--color-dark-gray);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-base);
}

.mobile-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background-color: var(--color-white);
  box-shadow: var(--shadow-md);
  padding: 1rem 0;
  z-index: var(--z-dropdown);
}

.mobile-nav .nav-list {
  flex-direction: column;
}

.mobile-nav .nav-list li {
  margin: 0.5rem 0;
  text-align: center;
}

/* Hero Section */
.hero-section {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12rem 0 8rem;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: var(--color-white);
  overflow: hidden;
}

.hero-section .overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.5));
  z-index: var(--z-negative);
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  z-index: var(--z-elevate);
}

.hero-content h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-lg);
  color: var(--color-white);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 1s ease-out;
}

.hero-content p {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xl);
  color: var(--color-white);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  animation: fadeInUp 1s ease-out 0.4s both;
}

/* Instructors Section */
.instructors-section {
  padding: var(--space-3xl) 0;
  background-color: var(--color-off-white);
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-lg);
  color: var(--color-black);
  position: relative;
  padding-bottom: var(--space-md);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.section-description {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--space-2xl);
  font-size: var(--font-size-lg);
}

.instructors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-xl);
}

.card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.card-image {
  width: 100%;
  height: 400px;
  overflow: hidden;
  text-align: center;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform var(--transition-slow);
}

.card:hover .card-image img {
  transform: scale(1.05);
}

.card-content {
  padding: var(--space-xl);
  text-align: center;
  flex: 1;
}

.card-content h3 {
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

.instructor-title {
  font-size: var(--font-size-md);
  color: var(--color-gray);
  margin-bottom: var(--space-md);
}

.stats-widget {
  display: flex;
  justify-content: center;
  margin-top: var(--space-lg);
}

.stat {
  text-align: center;
  padding: 0 var(--space-md);
  border-right: 1px solid var(--color-light-gray);
}

.stat:last-child {
  border-right: none;
}

.stat-number {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-gray);
}

/* Case Studies Section */
.case-studies-section {
  padding: var(--space-3xl) 0;
  background-color: var(--color-white);
}

.case-studies-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.case-study {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  background-color: var(--color-off-white);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.case-study:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.case-study:nth-child(even) {
  flex-direction: row-reverse;
}

.case-study-image {
  flex: 0 0 40%;
  overflow: hidden;
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
  display: flex;
  justify-content: center;
  align-items: center;
}

.case-study-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.case-study:hover .case-study-image img {
  transform: scale(1.05);
}

.case-study-content {
  flex: 1;
}

.case-study-content h3 {
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

/* Research Section */
.research-section {
  padding: var(--space-3xl) 0;
  background-color: var(--color-off-white);
  position: relative;
  overflow: hidden;
}

.research-tabs {
  margin-top: var(--space-2xl);
}

.tabs-container {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  position: relative;
}

.tabs-container::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-light-gray);
}

.tab-button {
  padding: var(--space-md) var(--space-xl);
  background: none;
  border: none;
  color: var(--color-gray);
  font-weight: 500;
  font-size: var(--font-size-md);
  cursor: pointer;
  position: relative;
  transition: color var(--transition-base);
}

.tab-button::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 4px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
  z-index: 1;
}

.tab-button:hover {
  color: var(--color-primary);
}

.tab-button.active {
  color: var(--color-primary);
}

.tab-button.active::after {
  width: 100%;
}

.tab-content-container {
  position: relative;
}

.tab-content {
  display: none;
  animation: fadeIn 0.5s ease-in-out;
}

.tab-content.active {
  display: block;
}

.research-item {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
}

.research-image {
  flex: 0 0 40%;
  overflow: hidden;
  border-radius: var(--border-radius-md);
}

.research-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.research-item:hover .research-image img {
  transform: scale(1.05);
}

.research-text {
  flex: 1;
}

.research-text h3 {
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

/* External Resources Section */
.external-resources-section {
  padding: var(--space-3xl) 0;
  background-color: var(--color-white);
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.resource-card {
  background-color: var(--color-off-white);
  border-radius: var(--border-radius-md);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.resource-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.resource-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
  text-align: center;
}

.resource-list {
  padding-left: var(--space-xl);
  list-style-type: circle;
}

.resource-list li {
  margin-bottom: var(--space-md);
}

.resource-list a {
  color: var(--color-gray);
  transition: color var(--transition-base);
}

.resource-list a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* Sustainability Section */
.sustainability-section {
  padding: var(--space-3xl) 0;
  background-color: var(--color-off-white);
  position: relative;
  overflow: hidden;
}

.sustainability-content {
  display: flex;
  gap: var(--space-2xl);
  align-items: center;
  margin-top: var(--space-xl);
}

.sustainability-image {
  flex: 0 0 50%;
  overflow: hidden;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
}

.sustainability-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.sustainability-content:hover .sustainability-image img {
  transform: scale(1.05);
}

.accordion-container {
  flex: 1;
}

.accordion {
  margin-bottom: var(--space-md);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  background-color: var(--color-white);
}

.accordion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-lg);
  background-color: var(--color-white);
  cursor: pointer;
  transition: background-color var(--transition-base);
}

.accordion-header:hover {
  background-color: var(--color-light-gray);
}

.accordion-header h3 {
  margin: 0;
  font-size: var(--font-size-lg);
  color: var(--color-primary);
}

.accordion-icon {
  font-size: var(--font-size-xl);
  color: var(--color-primary);
  transition: transform var(--transition-base);
}

.accordion.active .accordion-icon {
  transform: rotate(45deg);
}

.accordion-content {
  padding: 0;
  max-height: 0;
  overflow: hidden;
  background-color: var(--color-white);
  transition: max-height var(--transition-base), padding var(--transition-base);
}

.accordion.active .accordion-content {
  padding: 0 var(--space-lg) var(--space-lg);
  max-height: 500px;
}

/* Contact Section */
.contact-section {
  padding: var(--space-3xl) 0;
  background-color: var(--color-white);
}

.contact-content {
  display: flex;
  gap: var(--space-2xl);
}

.contact-info {
  flex: 1;
}

.contact-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.contact-item h3 {
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.contact-form-container {
  flex: 1;
  background-color: var(--color-off-white);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
}

.contact-form {
  display: grid;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  margin-bottom: var(--space-sm);
  font-weight: 500;
  color: var(--color-dark-gray);
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: var(--space-md);
  border: 1px solid var(--color-light-gray);
  border-radius: var(--border-radius-md);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  background-color: var(--color-white);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 2px rgba(64, 98, 187, 0.2);
}

.checkbox-group {
  flex-direction: row;
  align-items: center;
  gap: var(--space-sm);
}

.checkbox-group input {
  margin: 0;
}

/* Footer Section */
.footer {
  background-color: var(--color-dark-gray);
  color: var(--color-white);
  padding: var(--space-2xl) 0 var(--space-md);
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-logo {
  flex: 1 0 300px;
}

.footer-logo img {
  margin-bottom: var(--space-md);
}

.footer-logo p {
  font-size: var(--font-size-md);
  opacity: 0.8;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xl);
  flex: 2;
}

.footer-column {
  flex: 1 0 200px;
}

.footer-column h3 {
  color: var(--color-white);
  margin-bottom: var(--space-lg);
  position: relative;
  padding-bottom: var(--space-sm);
}

.footer-column h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 3px;
  background-color: var(--color-primary);
}

.footer-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-column ul li {
  margin-bottom: var(--space-sm);
}

.footer-column ul li a {
  color: var(--color-light-gray);
  transition: color var(--transition-base);
  text-decoration: none;
}

.footer-column ul li a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

.social-links {
  display: flex;
  flex-direction: column;
}

.social-links li a {
  display: inline-flex;
  align-items: center;
  color: var(--color-light-gray);
}

.social-links li a:before {
  content: "";
  display: inline-block;
  width: 20px;
  height: 20px;
  margin-right: 10px;
  background-size: contain;
  background-repeat: no-repeat;
  filter: grayscale(100%) brightness(200%);
  transition: filter var(--transition-base);
}

.social-links li a[href*="facebook"]:before {
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path fill="%23000" d="M12 2.04C6.5 2.04 2 6.53 2 12.06C2 17.06 5.66 21.21 10.44 21.96V14.96H7.9V12.06H10.44V9.85C10.44 7.34 11.93 5.96 14.22 5.96C15.31 5.96 16.45 6.15 16.45 6.15V8.62H15.19C13.95 8.62 13.56 9.39 13.56 10.18V12.06H16.34L15.89 14.96H13.56V21.96C18.34 21.21 22 17.06 22 12.06C22 6.53 17.5 2.04 12 2.04Z"/></svg>');
}

.social-links li a[href*="twitter"]:before {
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path fill="%23000" d="M22.46 6C21.69 6.35 20.86 6.58 20 6.69C20.88 6.16 21.56 5.32 21.88 4.31C21.05 4.81 20.13 5.16 19.16 5.36C18.37 4.5 17.26 4 16 4C13.65 4 11.73 5.92 11.73 8.29C11.73 8.63 11.77 8.96 11.84 9.27C8.28 9.09 5.11 7.38 3 4.79C2.63 5.42 2.42 6.16 2.42 6.94C2.42 8.43 3.17 9.75 4.33 10.5C3.62 10.5 2.96 10.3 2.38 10V10.03C2.38 12.11 3.86 13.85 5.82 14.24C5.46 14.34 5.08 14.39 4.69 14.39C4.42 14.39 4.15 14.36 3.89 14.31C4.43 16 6 17.26 7.89 17.29C6.43 18.45 4.58 19.13 2.56 19.13C2.22 19.13 1.88 19.11 1.54 19.07C3.44 20.29 5.7 21 8.12 21C16 21 20.33 14.46 20.33 8.79C20.33 8.6 20.33 8.42 20.32 8.23C21.16 7.63 21.88 6.87 22.46 6Z"/></svg>');
}

.social-links li a[href*="instagram"]:before {
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path fill="%23000" d="M7.8 2H16.2C19.4 2 22 4.6 22 7.8V16.2C22 19.4 19.4 22 16.2 22H7.8C4.6 22 2 19.4 2 16.2V7.8C2 4.6 4.6 2 7.8 2M7.6 4C5.61 4 4 5.61 4 7.6V16.4C4 18.39 5.61 20 7.6 20H16.4C18.39 20 20 18.39 20 16.4V7.6C20 5.61 18.39 4 16.4 4H7.6M17.25 5.5C17.94 5.5 18.5 6.06 18.5 6.75C18.5 7.44 17.94 8 17.25 8C16.56 8 16 7.44 16 6.75C16 6.06 16.56 5.5 17.25 5.5M12 7C14.76 7 17 9.24 17 12C17 14.76 14.76 17 12 17C9.24 17 7 14.76 7 12C7 9.24 9.24 7 12 7M12 9C10.34 9 9 10.34 9 12C9 13.66 10.34 15 12 15C13.66 15 15 13.66 15 12C15 10.34 13.66 9 12 9Z"/></svg>');
}

.social-links li a[href*="linkedin"]:before {
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path fill="%23000" d="M19 3C20.1 3 21 3.9 21 5V19C21 20.1 20.1 21 19 21H5C3.9 21 3 20.1 3 19V5C3 3.9 3.9 3 5 3H19M18.5 18.5V13.2C18.5 11.4 17.8 10.1 16.1 10.1C15.3 10.1 14.7 10.5 14.3 11H14.2V10.4H12.4V18.5H14.2V13.7C14.2 12.9 15 12.6 15.5 12.6C16 12.6 16.7 13 16.7 13.7V18.5H18.5M6.9 8.6C7.8 8.6 8.4 7.9 8.4 7.1C8.4 6.3 7.8 5.6 6.9 5.6C6.1 5.6 5.4 6.3 5.4 7.1C5.4 7.9 6.1 8.6 6.9 8.6M7.8 18.5V10.4H6V18.5H7.8Z"/></svg>');
}

.social-links li a:hover:before {
  filter: grayscale(0%) brightness(100%);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Modals */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: var(--z-modal);
  align-items: center;
  justify-content: center;
}

.modal-content {
  position: relative;
  background-color: var(--color-white);
  max-width: 800px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-xl);
  animation: scaleUp 0.3s ease-out;
}

.close-modal {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: var(--font-size-2xl);
  color: var(--color-gray);
  cursor: pointer;
  transition: color var(--transition-base);
}

.close-modal:hover {
  color: var(--color-primary);
}

.modal-body {
  margin-top: var(--space-lg);
}

.modal-body img {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius-md);
  margin-bottom: var(--space-lg);
}

/* Success Page */
.success-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-2xl);
  background-color: var(--color-off-white);
}

.success-content {
  max-width: 600px;
  animation: fadeInUp 0.8s ease-out;
}

.success-icon {
  font-size: 5rem;
  color: var(--color-success);
  margin-bottom: var(--space-lg);
}

/* Privacy & Terms Pages */
.privacy-page, 
.terms-page {
  padding-top: 100px;
  padding-bottom: var(--space-3xl);
}

.privacy-content, 
.terms-content {
  max-width: 800px;
  margin: 0 auto;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleUp {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Responsive Design */
@media (max-width: 1200px) {
  :root {
    --font-size-4xl: 2.5rem;  /* Adjust for smaller screens */
    --font-size-3xl: 2rem;
    --font-size-2xl: 1.75rem;
    --space-3xl: 3rem;        /* Reduce top spacing for sections */
  }
  
  .case-study,
  .case-study:nth-child(even),
  .sustainability-content,
  .research-item,
  .contact-content {
    flex-direction: column;
  }
  
  .case-study-image,
  .sustainability-image,
  .research-image {
    flex: 0 0 100%;
    margin-bottom: var(--space-lg);
  }
}

@media (max-width: 992px) {
  .desktop-nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .mobile-nav.active {
    display: block;
  }
  
  .hero-content h1 {
    font-size: var(--font-size-3xl);
  }
  
  .hero-content p {
    font-size: var(--font-size-lg);
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
  }
  
  .btn {
    width: 100%;
    max-width: 300px;
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--space-xl);
  }
}

@media (max-width: 768px) {
  .instructors-grid,
  .resources-grid {
    grid-template-columns: 1fr;
  }
  
  .tabs-container {
    flex-wrap: wrap;
  }
  
  .tab-button {
    flex: 1 0 40%;
  }
  
  .contact-details {
    grid-template-columns: 1fr;
  }
  
  .hero-section {
    padding: 8rem 0 4rem;
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
  
  .section-description {
    font-size: var(--font-size-base);
  }
}

@media (max-width: 576px) {
  :root {
    --container-padding: var(--space-sm);
  }
  
  .card-image {
    height: 300px;
  }
  
  .stats-widget {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .stat {
    border-right: none;
    border-bottom: 1px solid var(--color-light-gray);
    padding: var(--space-sm) 0;
  }
  
  .stat:last-child {
    border-bottom: none;
  }
  
  .tab-button {
    flex: 1 0 100%;
  }
}